Implement interactive CLI for LLM providers with chat, tools, and image support

- Add Bubble Tea-based CLI interface for LLM interactions.
- Implement `.env.example` for environment variable setup.
- Add provider, model, and tool selection screens.
- Include support for API key configuration.
- Enable chat interactions with optional image and tool support.
- Introduce core utility functions: image handling, tool execution, chat request management, and response rendering.
- Implement style customization with Lip Gloss.

go.sum

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@@ -48,6 +87,8 @@ github.com/tidwall/pretty v1.2.1 h1:qjsOFOWWQl+N3RsoF5/ssm1pHmJJwhjlSbZ51I6wMl4=
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